The Amazing Adventures of ANSI Dude

ANSI Dude is an interesting action-adventure. The name of the game obviously refers to its quite sophisticated text-only ANSI graphics.
The animated intro explains the background story (sort of): You play ANSI Dude, who, for unknown and pretty irrelevant reasons, lands his spacecraft on some strange planet and enters a 24-level dungeon.
Each dungeon level takes up one screen, seen from above. Each level is a maze, often filled with enemies; some blocks may be moved, other destroyed, so you can create you way through the maze. Other elements of the maze are conveyor belts which move you quickly to another position; mines you should avoid; locked doors that can only be opened by key cards you have to collect first, etc. To help you, there are also energy and battery recharge units as well as extra score "thingys" and 1-ups.